Tondabayashi Ecomarathon

🏯Event Name🏯

Osaka Castle Triathlon 2026

[Event Classification]

2026 NTT Triathlon Age Group National Championship Series(Standard・Sprint) / 2026 Osaka Prefectual Triathlon Sports Festival / 35th Osaka Prefectual Triathlon Championship

[Date]

Sunday May 31th, 2026

[Venue]

Main Venue:Osaka Castle Park / Swim: Osaka Castle East Outer Moat

[Organizer]

Osaka Castle Triathlon Organizers Committee

[Members of Organizers Committee]

Osaka City, Triathlon Japan and Osaka Prefectural Triathlon Association (OPTA)

[Race Managing Body]

Osaka Prefectural Triathlon Association (OPTA)

[Special Partner]

TBA

[Sponsors]

TBA

Event Distances:

Elite Sprint Distance (Swim 0.75km/Bike 20km/ Run 5km)

Age Group Standard Distance (Swim 1.5km/Bike 37.02km/ Run 10km)

Age Group Sprint Distance (Swim 0.75km/Bike 18.69km/ Run 5km)

Relay Team Sprint Distance (Swim 0.75km/Bike 18.69km/ Run 5km)

Cut-Off Times:

Standard Distance:

Swim finish 45 min / Bike finish 2 hrs and 30 min / Total finish 3 hrs and 40 min after the swim start.

Sprint Distance:

Swim finish 30 min / Bike finish 1 hrs and 25 min / Total finish 2 hrs and 5 min after the swim start.

Qualifications:

Elite Sprint Distance:

In order to participate, you have to register through your own National Federation. Please contact your own National Federation for more information.

Each National Federation is establishing its own qualification system for athletes to compete at the Elite race.

Age Group Standard Distance:

Triathlon Japan 2026 Registered member.

Age must be 18 or older on December 31st, 2026.

Capable of finishing in less than the cut-off time.

Age Group Sprint Distance:

Triathlon Japan 2026 Registered member.

Age must be 15 or older on December 31st, 2026.

Capable of finishing in less than the cut-off time.

Relay Team Sprint Distance:

At least one team member has a Triathlon Japan 2026 one-time team relay membership.

Age must be 16 or older on the December 31st, 2026.(Each member)

Capable of finishing in less than the cut-off time.

Registration Fees:

Standard（Triathlon Japan single-event membership fee included）¥34,000

Standard（Participants living in Japan and registered as 2026 Triathlon Japan members）¥29,500

Sprint（Triathlon Japan single-event membership fee included）¥24,500

Sprint（Participants living in Japan and registered as 2026 Triathlon Japan members）¥20,000

Please small note:

If entry exceed the number of capacities, we will use draw lots to decide.

Awards:

Elite Sprint Distance:

The top three places for both male and female.

Age Group Standard Distance:

All male and female TOP THREE athletes. The TOP THREE places for the male and female athletes in each age group.

Age Group Sprint Distance:

All male and female TOP THREE athletes.

Relay Team Sprint Distance:

The TOP THREE relay teams for the following categories: All Male, All Female, and Mixed.

Bike Rental:

https://eventdev.osaka-triathlon.com/wp-content/uploads/2025/11/osaka-jo-triathlon-2026-flyer-.pdf